Among the latent heat storage media considered for short-term storage of solar and nonsolar heat in house heating and process heat applications, barium hydroxide is particularly promising because of its large storage density and its storage temperature of 78 °C. Results of tests with a 25 kWh barium hydroxide “dynamic” latent heat storage unit are reported. The investigations included the discharge behavior, the range of possible discharge powers, variations of the power during discharges, and the “useful” temperature for a future applier. The results are encouraging. The medium remained unchanged during 40 charge/discharge cycles performed within ten months. Storage densities up to 125 kWh/m3 were achieved with a potential for still higher ones.

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